Kei "Kei-chan" Tsukikage

A younger brother of Toshi. he is kindergartener who is full of curiosity.
Kei fan of Ganbaman, he loves Gamba White that is a leader of Gambaman.
Because he who is still the kindergartner cannot catch up with Isami and Toshi and Soushi in the fifth grade, he is often left.
Still, he often helps Shinsengumi up against a wall.